Biden, Warren top latest poll of 2020 Democratic field

Former Vice President Joe BidenJoe BidenJimmy Carter: 'I hope there's an age limit' on presidency 2020 candidates keep fitness on track while on the trail Mark Mellman: The most important moment in history? MORE and Sen. Elizabeth WarrenElizabeth Ann WarrenKavanaugh impeachment push hits Capitol buzz saw Mark Mellman: The most important moment in history? Katie Pavlich: The Democrats' desperate do-overs MORE (D-Mass.) are leading the 2020 Democratic presidential field, according to a poll released Thursday.

The NBC News/Wall Street Journal survey found that 26 percent of likely primary voters support Biden, while 19 percent support Warren. Trailing those two are Sens. Kamala HarrisKamala Devi HarrisKavanaugh impeachment push hits Capitol buzz saw Mark Mellman: The most important moment in history? Biden leads in new national poll, Warren close behind in second place MORE (D-Calif.) and Bernie SandersBernie SandersJimmy Carter: 'I hope there's an age limit' on presidency 2020 candidates keep fitness on track while on the trail Mark Mellman: The most important moment in history? MORE (I-Vt.), who are each backed by 13 percent. 

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The only other contenders who receive support from more than 1 percent of voters are South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegKavanaugh impeachment push hits Capitol buzz saw 2020 candidates keep fitness on track while on the trail Mark Mellman: The most important moment in history? MORE with 7 percent, former Texas Rep. Beto O'RourkeBeto O'RourkeOvernight Energy: Top presidential candidates to skip second climate forum | Group sues for info on 'attempts to politicize' NOAA | Trump allows use of oil reserve after Saudi attacks Five top 2020 Democrats haven't committed to MSNBC climate forum Yang campaign says it received 450K entries for 'Freedom Dividend' contest MORE with 2 percent and former tech executive Andrew YangAndrew YangBiden leads in new national poll, Warren close behind in second place California poll: Biden, Sanders lead Democratic field; Harris takes fifth The Hill's Morning Report - What is Trump's next move on Iran? MORE with 2 percent. 

Warren reportedly fares best with self-described liberals and those aged 18 to 49, while Biden is strongest among older Democrats and African Americans.

Respondents were also asked about their second-choice candidate, which Harris led with 14 percent. She was followed by Warren with 13 percent, Sanders with 12 percent and Biden with 10 percent. 

Only 12 percent of Democratic primary voters, however, said they had definitively made up their mind about their choice. 

Researchers surveyed 800 registered voters including 400 Democratic primary voters between July 7 and 9, after the first primary debates. The margin of error on the primary voters is 4.9 percentage points.